Thread-cutting temple



June 20, 1939. D HERRWG I 2,163,308

THlEAD CUTT ING TEMPLE Filed March 6, 1939 INVENT OR. FAA NK 0. HEEE/NG.

5 :7. BY M $9M TATTORNEY.

Patented June 20, 1939 UNITED STATES THREAD-CUTTING TEMPLE Frank D. Herring, Awagon, Ga.,

Draper Corporation, poration of Maine Application March 6,

7 Claims.

The present invention pertains to thread cutting temples for looms, and more particularly relates to the construction of the'thread cutting devices of such temples. I

Thread cutting devices of the kind to which my invention applies commonly include a ledger blade and a rocking and sliding movable thread cutter blade having a depending cutting tip cooperating with the ledger blade to cut a filling thread extending from the cloth selvage, As commonlyconstructed, such movable blade is mounted to first rock downwardly to engage its tip behind a filling thread, to then slide forwardly to out the thread, and to then rock upwardly and slide rearwardly in returning to its normal idle position. These devices require some 7 means for holding the movable blade in contact with the ledger blade to insure a proper cutting operation.

Prior to the present invention, the aforesaid means for holding the movable thread cutter blade against the ledger blade has consisted of a continuously-acting spring, of which various types have been proposed. Such springs are, however, objectionable in that their action is not always sufiiciently positive, and in that their continuous action causes undue wear of the blades and may interfere with the idle or return stroke of the movable blade, which return stroke is usually imparted by a spring.

A principal object of the present invention is to provide a temple thread cutting mechanism having a ledger blade and a rocking and sliding thread cutter blade as aforesaid, and a fixed cam means for camming the movable blade laterally against the ledger blade, which cam means shall be operative upon the rocking of the movable blade in the direction to engage a filling thread and which cam means shall preferably release the movable blade during the return movement thereof. 1

The foregoing and other objects of the invention are accomplished in the construction illustrated on the accompanying drawing, of which:

Fig. 1 is a plan view, partly in section, of a loom temple having the preferred embodiment of my invention applied thereto;

Fig. 2 is a view in elevation of said temple;

Fig. 3 is a view in cross-section taken approximately on the line 33 of Fig. 1 but to a larger scale; and

Fig. 4 is a detail view in perspective.

The preferred embodiment of my thread cutting mechanism is shown on the drawing as being applied to a loom temple which is generally of conventional construction except as hereinafter described. This temple includes a housing I which is adapted to be mounted on a loom frame (not shown), a bar 2 which is slidably supported by the housing, and a laterally extending head 3 assignor to Hopedale, Mass, a cor- 1939, Serial No. 260,069

The temple is positioned with the bar 2 parallel to the cloth selvage S and with the head 3 embracing the cloth C just forwardly from the fell F thereof, as is usual in the art. The temple head 3 may be provided with the usual heel 5 by which the temple is reciprocated.

The usual weaving operation forms, at intervals, a filling end 1 which projects from the cloth selvage S. Temple thread cutting mechanism is provided to cut or trim the filling ends 7 adjacent the cloth selvage. My improved thread cutting mechanism as shown includes a ledger blade 6 and a movable blade 7 which are mounted in a guideway 8 in the temple head.

The guideway 8 is located substantially in a vertical plane and extends entirely through the temple head 3 from the front to the rear thereof. The ledger blade 6 may consist of a flat steel member which'is located in the guideway 8 at the rearward end thereof. The rearward vertical edge 9 of the ledger blade is sharpened to provide a cutting edge. The ledger blade may be held in the guideway in any suitable usual manner, as by a screw Ill. is loosely mounted in the guideway 8 for rocking and sliding movements.

The particular movable blade 1 shown is similar to prior blades in that it extends generally horizontally through the guideway 8 and is provided at its rearward end with a depending cutting tip Il and at its forward end with a depending heel l2. One side edge of the tip H is sharpened to cooperate with the edge 9 in cutting the filling end 1. The movable blade is given its operative or cutting movement when the loom lay (not shown) strikes the heel l2 and is given its idle or return movement by a wellknown spring Ill. The construction is such that the movable blade normally occupies the dotted line position in which it is shown on Fig. 3. Then, when the lay strikes the heel I2 the movable blade first rocks downwardly, to engage the tip H behind a filling end f, and then slides forwardly, which is toward the left on Fig. 3. This forward sliding movement causes the filling end f to be cut by the tip ll and edge 9. When the lay recedes rearwardly the spring l3 imparts an upward rocking and rearward sliding movement to the movable blade to return the latter to its normal or idle position.

It will be apparent that, if the filling end i is to be cut, the movable blade I must be held in contact with the ledger blade 6 throughout the forward or operative movement of the movable blade. In accordance with my invention, this result is accomplished by suitable cam means for camming the movable blade 1 laterally against the ledger blade 6, such cam means being arranged to force the movable blade laterally upon The movable blade 1 downward rocking movement of the latter. The

cam means includes a cam surface which may be located either upon a fixed member or upon the movable blade, although I prefer to provide cam surfaces upon both said member and said blade provided with a cam surface [5 on its lower edge 7 directly over the surface [5. The member l4 may be formed in any suitable manner, but as shown it comprises a steel block which is welded or otherwise fixed to the ledger blade 6. The surfaces 15 and iii are inclined from the outer edge of the guideway 8 downwardly toward the ledger blade 6. The member 44 is so positioned that the surface M will be engaged by the surface l5 when the movable blade 1 is rocked downwardly as aforesaid, and the surfaces will thereupon cam the movable blade laterally against the ledger blade 6. The'construction is such that the two cutter blades will be held in contact throughout the operative movement, thus insuring the cutting of the filling end.

The cam means just described releases the movable blade I when and as the latter rocks upwardly. The movable blade is thus freed from any restraining friction and is freely and easily movable by the spring l3. There is, accordingly, no possibility that the movable blade will stick and fail to be returned by the spring I3. It is also noted that the member l4 prevents the movable blade 7 from coming in contact with and wearing the pin I! on which the roll 4 is mounted.

Having fully disclosed the preferred embodiment of my invention, I claim:

1. A temple thread cutting mechanism comprising a ledger blade, a movable blade having a depending cutting portion cooperating with said ledger blade, means mounting said movable blade for a rocking movement to engage said portion behind a filling thread and a forward sliding movement to cut the filling thread, and a fixed member having a cam surface for forcing said movable blade laterally against said ledger blade, said cam surface being positioned to be engaged by said movable blade upon rocking of the latter as aforesaid.

2. A temple thread cutting mechanism comprising a ledger blade, a movable blade having a depending cutting portion cooperating with said ledger blade, means mounting said movable blade for a downward rocking and forward sliding operative movement and an upward rocking and rearward sliding return movement, and a fixed member having a cam surface for forcing said movable blade laterally against said ledger blade, said cam surface being positioned to be engaged by said movable blade upon downward rocking of the latter and to release said movable blade upon said upward rocking movement.

3. A temple thread cutting mechanism comprising a ledger blade, a movable blade having an inclined cam surface on its lower edge and a depending cutting tip at its rearward end for cooperation with said ledger blade, a guideway in which said movable blade is mounted for a downward rocking movement to engage said tip behind a filling thread and a forward sliding movement to cut the filling thread, and a fixed member located below said movable blade and ment to engage said tip behind a filling thread i and a forward sliding movement to cut the filling thread, and a fixed member having a surface located below said movable blade in position to be engaged by a surface on the lower edge of the movable blade when the latter rocks downwardly as aforesaid, at least one of said surfaces being inclined downwardly toward said ledger blade to force said movable blade laterally into engagement with said ledger blade.

5. A loom temple having a thread cutting mechanism comprising a ledger blade, a movable thread cutter blade having a depending cutting tip cooperating with said ledger blade, means supporting said movable blade for a downward rocking movement to engage said tip behind a filling thread and a forward sliding movement to cut the filling thread, and a rigid member fixed to said ledger blade below said movable blade, said member having a surface positioned to be engaged by a surface on said movable blade when the later rocks downwardly .as aforesaid and at least one of said surfaces being shaped to cam said movable blade laterally against said ledger blade.

6. A loom temple having a thread cutting mechanism comprising a ledger blade, a movable thread cutter blade having a depending cutting tip cooperating with said ledger blade, a guideway in which said movable blade is mounted for a downward rocking and forward sliding operative movement and an upward rocking and rearward sliding return movement, and a rigid member fixed to said ledger blade and having a cam surface for forcing said movable blade laterally against said ledger blade, said surface be ing positioned to be engaged by said movable blade upon said downward rocking of the latter and to release said movable blade upon said upward rocking movement thereof.

'7. A loom temple comprising a temple head having a guideway therein, a vertical ledger blade at the rearward end of said guideway, a movable thread cutter blade having a depending cutting tip at its rearward end for cooperation with said ledger blade, said movable blade being loosely mounted in said guideway for a downward rocking and forward sliding operative movement and an upward rocking and rearward sliding return movement, and a cam member fixed to said ledger blade below said movable blade, said member and said movable blade having cooperating cam surfaces inclined downwardly toward said ledger blade for forcing said movable blade laterally against said ledger blade, said surface on said member being positioned to beengaged by said movable blade upon said downward rocking movement of the latter and to release said movable blade during said return movement thereof.

FRANK D. HERRING. 

